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Enable trigger tips

Oracle Database Tips by Donald BurlesonJuly 2, 2015

 

Question:  Can I disable a insert trigger for a SQL*Loader run and then "enable" the trigger: afterwards?

 
Answer:  Sometimes, you'll want to turn off a trigger so data can be loaded more quickly. This can be done by using the ALTER TRIGGER command in SQL*Plus, as illustrated here:

ALTER TRIGGER STUDENTS_ARIU DISABLE;

If there is more than one trigger on a table and you want to disable all the triggers in one fell swoop, you can use the ALTER TABLE command shown here instead:

ALTER TABLE STUDENTS DISABLE ALL TRIGGERS;

Remember that when a trigger is disabled, data that is loaded into the table isn't processed by the trigger at all. The trigger doesn't even fire. Consequently, if your triggers are validating data or enforcing complex business rules, you run some risks by disabling triggers. Re-enabling a trigger does not cause it to fire retroactively.

Database triggers can be turned on again by using the same commands with ENABLE substituted for DISABLE, as shown in the following:

ALTER TRIGGER STUDENTS_ARIU ENABLE;
ALTER TABLE STUDENTS ENABLE ALL TRIGGERS;

Naturally, executing these commands requires that you have the proper privileges (ALTER TRIGGER, ALTER TABLE, or ALTER ANY OBJECT).

   
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